| 摘要 |
<p>Use of a monomeric mixture for preparing a thermosetting copolymer in the form of optical products having an index of refraction nD<2><0> of at least 1,52, obtained by polymerization of one or more components of a first monomer obtained by reacting the epoxy groups of an aromatic polyepoxide with a phthalic acid half ester of the formula <CHEM> wherein X signifies a hydrogen, bromine and/or chlorine atom, R represents a hydrogen atom or methyl group, r = 1 or 0, with R min , when r = 0, representing a -CH2- group and, when r = 1, representing a substituted or unsubstituted alkylene group having 2-6 carbon atoms or the group -CH2- @HO-CH2- @<H>-, wherein R has the above-indicated meaning and of which the hydroxyl groups may optionally be esterified with an aliphatic or aromatic acyl group, and one or more components of a second one or more vinyl or allyl groups-containing compound polymerizable under the influence of radicals. Preferably the aromatic polyepoxide corresponds to the formula: <CHEM> wherein q = 0 or 1, X has the meaning indicated above, n = 0-3, and wherein, when q = 1, A has the meaning of an optionally substituted alkylidene group having 1-3 carbon atoms, SO2, S or O. One of the preferred copolymerizable compounds corresponds to the formula <CHEM> wherein R = H or CH3, Z = H, Cl, Br, methyl, methoxy, phenyl or phenoxy, and a = 1 or 2.</p> |
